$EF4A/61258: Compute Bit Count
Jump from $F41D:
EF4A: A2 09 LDX #$09
EF4C: A9 20 LDA #$20
EF4E: 2C 93 02 BIT $0293 ; RS232 Pseudo 6551 control Register Image
EF51: F0 01 BEQ $EF54
EF53: CA DEX
Jump from $EF51:
EF54: 50 02 BVC $EF58
EF56: CA DEX
EF57: CA DEX
Jump from $EF54:
EF58: 60 RTS
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